The scroll to top button that appears as a square in right side of demo, appears to be broken on my install of theme. It shows as a caret on bottom left with no box, and only appears below socket. Any suggestions on why this is broken or how to resolve?

A couple of things to try: First, re-upload the theme after re-downloading it from themeforest. There could have been an issue with the files at either part and hopefully this time the download/upload overwrites any of the corrupted files on the server (if this was the case).

The second is to deactivate any active plugins you have installed. If you have any caching plugin installed, clear its cache before deactivating.